feat: use default config path when no arg for -f is provided #14008

Job	Run time
changed_files	15s
towncrier_check	20s
check_if_release_branch	3s
build mirrord CLI	0s
integration_tests	4m 44s
check-rust-docs	1m 8s
lint_markdown	0s
test_agent	3m 53s
macos_tests	4m 49s
test_agent_image	37s
test_cli_image	4m 36s
lint	3m 28s
e2e (docker)	4m 0s
intellij_e2e_on_release_branch	0s
e2e (containerd)	4m 0s
vscode_e2e_on_release_branch	0s
ci	1s
	31m 54s

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